Who knows about GT40 engines?

Hey guys, getting a checklist ready for the season of things to do. My '99 needs a little tuning. Last year I bought it with about 425 hours and I put about 15 +/- hours on it. I brought it to MacCallum's Boathouse for a little work. My buddy Jeff also did a little work to the engine. It got new plugs, wires, cap, rotor, fuel filter, impeller and steering cable. I also put some fuel injection cleaner in the tank. Every once in a while after skiing the course, the engine sounds like the RPMs are dropping too low after being put into gear. So much so it feels like it could stall but doesn't. I had the idle adjustment tuned by MacCallum's. Also sometimes after idling and then pulling a skier, it hestitates slightly. I read about a low pressure fuel pump part for about $160 that could be the issue. Is this something anyone else has heard of? Also, are there any fuel screens or parts that could be clogged? I'm hoping I can fix this minor issue myself. Thanks in advance for advice.

Thanks,

Ken

Thanks, Joel. I'll track down Lewy. The issue is minor and intermittent. I wonder how hard it is to chase. Other than that the engine is strong!

The very first thing to check is to see if the short fuel line is cracked inside the fuel cell.

Ken it is the hose from the high pressure pump to the outlet on top of FCC. The hose is known to crack and create fuel pressure problems. This is the FCC with the casing removed to access fuel filter. Have you changed the fuel filter inside if not order one and the hose and do at the same time.

Yes, I have changed the fuel filter and that didn't help the hesitation issue. It sounds like it's starving for gas momentarily and then it kicks in.

Thanks for all your help, Lewy. As soon as the weather warms up, I'll get those parts installed and let you know. Where is the fuel relay located on the engine? Looks like an easy install.

Ken

Thank you, Lewy. Have a good night!

Great info. I never took pics but its less daunting seeing what you're getting into.

For under $5.00 I would certainly start there! Throw in a filter to eliminate that piece as well.

Zach at N3 should be able to get you the parts. I got the hose from SkiDim last year and they knew what I was dealing with right away.

Chris, I just had ankle surgery, so I went from a boot to a cast. They put a hefty looking deck screw through my ankle bone to heal it. Lesson learned, stand up when you know you have no chance of making a buoy! Thanks for asking.

Just ordered the fuel hose and two relays from SKIDIM. I'm told that both relays are identical. Funny how they do two different things but they're the same. Got a new oil filter, just need to find out what oil the GT40 drinks. Lastly my winch strap that the Ramlin keeps putting holes in. Good to go for now. Will let you guys know how the fuel parts fix the momentary hesitation issue.

Ken

OK, found them. Does anyone know the automotive equivalent so I can buy them locally?

Just went out and bought two replacement relays, here are some automotive equivalents:

-BWD R4810 Advance Auto Parts $15.75
-Relays NAPA ECH AR174
-Hella 4RD 960 388-31.   1688314CI

Unfortunately, the relays must not be the problem. Still no 2 second fuel pump noise with ignition turn on.

Whats next? Fuel pump(s) I have replace the smaller pump a couple years ago, would be surprised if it broke already.

Ideas?

Thanks

Mike

OK, will try that in the AM